[Kurt in NJ]

A larger rotor gap works to fire fouled plugs better, a bandaid for improper mixture same as all the playing with sparkplug heat ranges to cure the black carbon from too rich of a mixture.
It takes more spark voltage to jump all the gaps, at higher speeds the coil voltage is reduced ,
So other than the “red book”( I don’t have one) where is the .025 rotor gap specification listed, Ford blueprint? The later production new Ford parts in my car had a .010 gap average on my car.